DEVICE FOR POSITIONING THE POINT OF IMPACT ON A SPECIMEN DURING STATIC FIRING TESTS

Abstract

A system (1) for adjusting the point of impact (2) of a projectile on a specimen (3), comprising a bench (4) having a support (6) and a wall (7) erected vertically from said support (6), and a device for positioning the point of impact (5) positioned on said wall (7) of the bench (4). The system (1) includes means for adjusting the position of the point of impact (2) on the specimen (3) along three orthogonal directions (X, Y, Z), and the device for positioning the point of impact (5) includes means for adjusting the angle of incidence of the point of impact (2) on the specimen (3). Figure for the abstract: Fig 1

Description

Title of the invention: DEVICE FOR POSITIONING THE POINT OF IMPACT ON A SPECIMEN DURING STATIC SHOT TESTS Technical field

[0001] The present invention relates to the field of static firing tests of projectiles on a specimen and particularly the positioning of the point of impact of a projectile on a specimen during static firing tests.

[0002] The invention relates in particular to the impact resistance test of aeronautical parts.

[0003] Static firing tests of projectiles on a specimen are very important, particularly for testing the impact resistance of the specimen. In order to simulate bird collisions, gelatin projectiles are projected onto aeronautical parts. This makes it possible to test the impact on a specimen and to predict possible improvements in the design of the parts.

[0004] Today, there are systems comprising launching means configured to project projectiles into a particular area of ​​a machine. Document FR3120440A1 is known, which describes a test bench comprising a firing means, and a method for tracking debris.

[0005] However, the firing guns used during static firing tests are sometimes fixed relative to the target or are difficult to move. The objective is therefore to adjust the target's impact position directly.

[0006] Existing setups have shown various problems. Firstly, the sizes and profiles of the parts being tested are becoming increasingly complex, making adjustments to the firing position on the parts tedious and imprecise, particularly adjustments to the firing height and angle of incidence. Secondly, a machine tool dividing table is often used for static firing tests, which is not well-suited for high-energy firing. Finally, the position used for a specimen is not easily repeatable on the same specimen and transposition of the setup for another specimen is impossible. Statement of the invention

[0007] The present invention aims to overcome these drawbacks by improving the precision and ease of adjustment of the points of impact of shots on the parts.

[0008] The invention therefore relates to a system for adjusting a point of impact of a projectile on a specimen, comprising a bench comprising a support and a wall erected vertically from said support, and a device for positioning the point impact positioned on said wall of the bench. Said system comprises means for adjusting the position of the point of impact on the specimen in three orthogonal directions (longitudinal, vertical and transverse) and said device for positioning the point of impact comprises means for adjusting the angle of incidence of the point of impact on the specimen.

[0009] Advantageously, the means for adjusting the position of the point of impact in the vertical direction comprise vertical grooves extending over the entire height of the wall, and means for fixing the device for positioning the point of impact on the wall.

[0010] Optionally, the bench wall includes a screw jack positioned under the impact point positioning device, allowing precise adjustment of the impact point on the specimen in the vertical direction.

[0011] According to one embodiment, the means for adjusting the position of the point of impact in the transverse direction comprise transverse grooves extending over the entire length of the support, and means for fixing the wall to the support.

[0012] Advantageously, the grooves in the wall and the support of the bench also make it possible to adjust the position of the point of impact on the specimen in a longitudinal direction.

[0013] The means for adjusting the angle of incidence of the point of impact comprise graduations allowing the value of the angle of incidence to be displayed, a system for retaining the rotation of the device for positioning the point of impact and a digital inclinometer allowing the angle of incidence of the point of impact on the specimen to be precisely measured.

[0014] Advantageously, the means for adjusting the angle of incidence of the specimen comprise a support part produced by stereolithography and matching the shape of the specimen.

[0015] According to one embodiment, the device for positioning the point of impact comprises another screw jack allowing precise adjustment of the height of the point of impact on the specimen.

[0016] Optionally, the system for adjusting a point of impact comprises a laser beam representing the point of impact of the projectile on the specimen. Brief description of the drawings

[0017] Other aims, characteristics and advantages of the invention will appear on reading the following description, given solely by way of non-limiting example and made with reference to the appended drawings in which:

[0018] - [Fig.l] is a schematic view of a system for adjusting a point of impact of a projectile on a specimen;

[0019] - [Fig.2] is a schematic view of the adjustment of the position of the point of impact on a specimen in three orthogonal directions;

[0020] - [Fig.3] is a schematic side sectional view of a device for putting into position of the specimen under the driving conditions of the overall device for positioning the point of impact of a system for adjusting a point of impact of a projectile on a specimen;

[0021] - [Fig.4] is a schematic view showing the definition of the angle of incidence from the point of impact on a tested specimen;

[0022] - [Fig.5A] is a schematic view of the coarse angle adjustment means incidence of the point of impact on the specimen;

[0023] - [Fig.5B] is a schematic view of the coarse angle adjustment means incidence of the point of impact on the specimen;

[0024] - [Fig.6] is a schematic view of a positioning tool of a means of adjusting the angle of incidence on a test specimen; and

[0025] - [Fig.7] is a schematic view of the means for fine adjustment of the angle of incidence of the point of impact on a specimen using a pressure screw of the screw jack. Detailed description

[0026] A system 1 for adjusting a point of impact 2 of a projectile on a specimen 3 is shown in [Fig.l]. The system 1 for adjusting a point of impact 2 makes it possible to aim, for example with a gun, as precisely as possible, a well-defined point on a specimen 3 to be tested.

[0027] Such a system is advantageously used to test the impact resistance of aeronautical parts. This may be, for example, air inlet blades.

[0028] This system comprises a bench 4, a device for positioning the point of impact 5 and means for adjusting the position of the point of impact in three orthogonal directions, vertical Y, transverse Z and longitudinal X.

[0029] The bench 4 serves as a base for the entire system 1 and comprises a support 6 and a wall 7 erected vertically from the support 6.

[0030] The device for positioning the point of impact 5 is positioned on said wall 7 of the bench 4 and comprises means 8 for adjusting the angle of incidence a of the point of impact 2 on the specimen 3 to be tested.

[0031] As illustrated in [Fig.2], the means for adjusting the position of the point of impact 2 in the vertical direction Y comprise vertical grooves 9 extending over the entire height of the wall 7, and means 10 for fixing the device for positioning the point of impact 5 on the wall 7.

[0032] The fixing means 10 of the device for positioning the point of impact 5 on the wall 7 may be, for example, bolts, positioned over the entire surface of the device 5 in contact with the wall 7.

[0033] Optionally, the means for adjusting the position of the point of impact in the vertical direction Y also comprise a screw jack 11 positioned under the device for positioning the point of impact 5, making it possible to adjust the position of the point of impact 2 on the specimen 3 in the vertical direction Y as precisely as possible.

[0034] The position of the impact point positioning device 5 is thus adjusted in height.

[0035] As illustrated in [Fig.2], the means for adjusting the position of the point of impact 2 in the transverse direction Z comprise transverse grooves 12 extending over the entire length of the support 6, and means 13 for fixing the wall 7 to the support 6. The wall 7 can thus slide in the transverse grooves 12 of the support 6.

[0036] The means for fixing the wall 7 to the support 6 may be, for example, bolts, positioned over the entire surface of the wall 7 in contact with the support 6. The wall 7 may also include a bracket 14 or other assistance helping it to be held on the support 6.

[0037] The vertical grooves 9 and transverse grooves 12 are also means for adjusting the position of the point of impact 2 on the specimen 3 in the longitudinal direction X. In fact, the wall 7 can be placed at different positions across the width of the support 6, and the device for positioning the point of impact 5 can be placed at different positions across the width of the wall 7. This allows the specimen 3 and the point of impact 2 to move in space in the longitudinal direction X.

[0038] These adjustment means make it possible to adjust the position of the impact point 2 on the specimen 3 according to three degrees of freedom X, Y, Z.

[0039] [Fig. 3] shows a side sectional view of the device for positioning the point of impact 5. It comprises a fixed plate 15 stable on the wall 7, an angular plate 16 capable of moving in rotation and positioned on the fixed plate 15, and a support block 17, directly fixed to the center of the angular plate 16. The support block 17 follows the rotational movements of the angular plate 16.

[0040] Optionally, the device for positioning the point of impact 5 also comprises means reproducing the centrifugal force to which the specimen 3 is subjected, for example, a thrust wedge 18 controlled by a thrust screw 19.

[0041] As illustrated in [Fig.4], the angle of incidence a is defined by the angle formed between the chord 20 of the profile of the specimen part 3 and the axis 21 of the barrel.

[0042] In order to facilitate the adjustment of the positioning of the point of impact 2 on the specimen 3, and according to one embodiment, the gun projects a laser beam 22 onto the location to be tester, as shown in [Fig. 1].

[0043] In Figures 5A and 5B, the adjustment means 8 of the angle of incidence a shown allow a rough adjustment of the angle of incidence a of the point of impact 2 on the specimen 3. The adjustment means of the angle of incidence a comprise angular graduations 23, present on the angular plate 16, allowing the value of the angle of incidence a selected during the adjustments of the positioning of the point of impact 2 to be displayed. They also comprise a system for manually rotating the device for positioning the point of impact 5 relative to the fixed plate 15.

[0044] This rotation system is illustrated in Figures 5A and 5B and comprises, for example, a bar 29 which is inserted into a hole 24 provided for this purpose in the device for positioning the point of impact 5, and which makes it possible to trigger the manual rotation of the device for positioning the point of impact 5 by the operator. According to one embodiment, the hole 24 is located in the support block 17.

[0045] [Fig.7] illustrates the adjustment means 8 of the angle of incidence a which allow a fine adjustment of the angle of incidence a of the point of impact 2 on the specimen 3. They comprise a digital inclinometer 27 allowing the angle of incidence a of the point of impact on the specimen 3 to be measured precisely, and a screw jack 28 allowing the precise adjustment of the height of the point of impact 2 on the specimen 3.

[0046] The positioning means of the digital inclinometer 27 is partially shown in [Fig. 6]. It comprises a support part 25, for example made by stereolithography, which matches the shape of the specimen 3 to be tested and which is wedged in position by means of centering feet 26 matching the edges of the specimen 3.

[0047] The digital inclinometer 27 is for example installed on the support part 25, at the base of specimen 3, allowing for precise results according to the rotations of specimen 3. The screw jack 28 is, for example, located on the contour of the angular plate 16.

[0048] The adjustment of the angle of incidence a of the point of impact 2 can thus achieve a precision of 0.05°.

[0049] These different means of adjusting the position of the point of impact according to the orthogonal directions X, Y and Z and according to the angle of incidence a allow the specimen to have as many degrees of freedom as possible and thus to facilitate and specify the adjustment of the position of the point of impact 2 on the specimen 3.

[0050] This system is compatible with high energy firing tests capable of projecting projectiles of up to 4 kg, and is compatible with specimens having large sizes and complex geometry profiles, for example 3D aero profiles.

[0051] In addition, the system has good repeatability on the general position of the specimen tested and it is possible, during the tests, to make adjustment settings, without having to redo the complete assembly of the system.

[0052] Finally, the use of the same assembly for different parts is possible and may prove useful in certain situations.

Claims

Claims

1. System (1) for adjusting a point of impact (2) of a projectile on a specimen (3), comprising a bench (4) comprising a support (6) and a wall (7) erected vertically from said support (6), and a device for positioning the point of impact (5) positioned on said wall (7) of the bench (4), characterized in that it comprises means for adjusting the position of the point of impact (2) on the specimen (3) in three orthogonal directions (X, Y, Z) and in that the device for positioning the point of impact (5) comprises means (8) for adjusting the angle of incidence (a) of the point of impact (2) on the specimen (3).

2. Adjustment system (1) of an impact point (2) according to claim 1, in which the means for adjusting the position of the impact point (2) in the vertical direction (Y) comprise vertical grooves (9) extending over the entire height of the wall (7), and means (10) for fixing the device for positioning the impact point (5) on the wall (7).

3. Adjustment system (1) of an impact point (2) according to one of claims 1 and 2, wherein the wall (7) of the bench (4) comprises a screw jack (11) positioned under the impact point positioning device (5), allowing the precise adjustment of the impact point (2) on the specimen (3) in the vertical direction (Y).

4. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 3, in which the means for adjusting the position of the impact point (2) in the transverse direction (Z) comprise transverse grooves (12) extending over the entire length of the support (6), and means (13) for fixing the wall (7) to the support (6).

5. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 4, in which the grooves (9, 12) of the wall (7) and of the support (6) of the bench (4) also make it possible to adjust the position of the impact point (2) on the specimen (3) in a longitudinal direction (X).

6. Adjustment system (1) of a point of impact (2) according to any one of claims 1 to 5, in which the means for adjusting the angle of incidence (a) of the point of impact (2) comprise graduations (23) making it possible to display the value of the angle of incidence (a), a system for retaining in rotation the device for positioning the point of impact (5), and a digital inclinometer (27) for precisely measuring the angle of incidence (a) of the point of impact (2) on the specimen (3).

7. Adjustment system (1) for a point of impact (2) according to any one of claims 1 to 6, in which the adjustment means (8) for the angle of incidence (a) of the specimen (3) comprise a support part (25) produced by stereolithography and matching the shape of the specimen (3).

8. Adjustment system (1) of an impact point (2) according to any one of claims 1 to 7, in which the device for positioning the impact point (5) comprises a further screw jack (28) allowing the precise adjustment of the height of the impact point (2) on the specimen (3).

9. System for adjusting (1) a point of impact (2) according to any one of claims 1 to 8, comprising a laser beam (22) representing the point of impact (2) of the projectile on the specimen (3).

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